Summer in the Park is comparatively short. It may not be strictly true that "the Park has only three seasons, July, August, and Winter," but it is true that July and August are the only two months free from the ordinary characteristics of winter. Snows are frequent in June and September, while May and October are well on the snowy side of the year. July and August are the Park summer. The weather is settled. The air is pure and bracing and not too cold. The long imprisoned vegetation bursts suddenly into full life and beauty, and in a short period take place all the changes which require months in lower altitudes. That there is life and health in that summer atmosphere, no one who has breathed it will deny. At the same time, as has already been hinted, it is healthful only for those who have some foundation to build upon. Persons suffering from any form of heart disease or advanced pulmonary trouble, or those greatly reduced in strength from any cause, would better stay away. The altitude and sharp air might prove too severe. A matter which has naturally attracted considerable inquiry is the therapeutic value of the mineral springs of the Park. The superstitious faith in the efficacy of mineral waters to restore health, which has characterized mankind in all ages, caused the physically afflicted to hail the discovery of that region as the promised fountain of new life. The first explorers to ascend the Gardiner in 1871 found "numbers of invalids" encamped on its banks, where the hot waters from Mammoth Hot Springs enter the stream; and it is recorded that "they were most emphatic in their favorable expressions in regard to their sanitary effects." But this impression was very evanescent. No one now goes to the Park because of its mineral waters. Nevertheless, it would be wholly premature to assume that there is no medicinal virtue in them. Certainly there is in the Park almost every variety of mineral spring; there are abundant and luxurious waters for bathing; and it is not at all improbable that the opportunities afforded in this region may yet be utilized to the great advantage of the public. But for health-giving qualities, the Park will never be dependent on its mineral waters. Its true value lies in other and more potent influences. The pure water of its snow-fed streams, the exhilarating atmosphere, the bracing effect of altitude, the wholesome fatigue of daily rambles over the rough, mountainous country, the fragrant odor of the pine boughs which every-where pervades the atmosphere, and, above all, the beautiful and varied scenery, which exalts the mind and diverts the attention from cares that are too often the real cause of physical ills--these are the true virtues of the Yellowstone Park as a health resort. CHAPTER X. ROADS, HOTELS, TRANSPORTATION.